"""
Copyright (c) 2022 Huawei Technologies Co.,Ltd.

openGauss is licensed under Mulan PSL v2.
You can use this software according to the terms and conditions of the Mulan PSL v2.
You may obtain a copy of Mulan PSL v2 at:

          http://license.coscl.org.cn/MulanPSL2

THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
See the Mulan PSL v2 for more details.
"""
"""
Case Type   : DMS分布式锁
Case Name   : 在主节点获取X锁后，开启另一个session获取X锁会阻塞
Create At   : 2023/4/23
Owner       : opentestcase033
Description :
    1.创建测试表
    2.主节点开启事务A更新表名，事务B执行后回滚A
    3.主节点开启事务B，删除表
    4.清理环境
Expect:
    1.设置成功
    2.执行成功
    3.事务A回滚后，执行成功
    4.成功
History     :
"""

import os
import time
import unittest

from testcase.utils.Logger import Logger
from testcase.utils.CommonSH import CommonSH
from testcase.utils.Constant import Constant
from testcase.utils.ComThread import ComThread


class DmsOck(unittest.TestCase):

    def setUp(self):
        self.log = Logger()
        self.log.info(f'-----{os.path.basename(__file__)} start-----')
        self.pri_sh = CommonSH('PrimaryDbUser')
        self.constant = Constant()
        self.table = 't_dms_ock_0031'

    def test_dms_ock(self):
        text1 = '-----step1:创建测试表;expect:成功-----'
        self.log.info(text1)
        create_tb = f"drop table if exists {self.table};" \
                    f"create table {self.table}(" \
                    f"id int, name varchar, source number) " \
                    f"with (segment = on);" \
                    f"insert into {self.table} values(1,'haha',92);"
        create_res = self.pri_sh.execut_db_sql(create_tb)
        self.log.info(create_res)
        self.assertIn(self.constant.CREATE_TABLE_SUCCESS, create_res,
                      f"执行失败:{text1}")
        self.assertIn(self.constant.INSERT_SUCCESS_MSG, create_res,
                      f"insert失败:{text1}")

        text2 = '-----step2:主节点开启事务A更新表名，事务B执行后回滚A;' \
                'expect:执行成功-----'
        self.log.info(text2)
        sql1 = f"start transaction;" \
               f"alter table {self.table} " \
               f"rename to new_{self.table};" \
               f"select pg_sleep(3);" \
               f"rollback;"
        session1 = ComThread(self.pri_sh.execut_db_sql, args=(sql1,))
        session1.setDaemon(True)
        session1.start()
        time.sleep(1)

        text3 = '-----step3:主节点开启事务B，删除表;expect:事务A回滚后，执行成功-----'
        self.log.info(text3)
        sql2 = f'''begin;
        select locktype,relname,mode from pg_locks,pg_class 
        where relation = oid and relname = '{self.table}';
        drop table {self.table};
        end;'''
        session2 = ComThread(self.pri_sh.execut_db_sql, args=(sql2,))
        session2.setDaemon(True)
        session2.start()
        session1.join(10)
        session2.join(10)
        result1 = session1.get_result()
        self.log.info(f'session1_results: {result1}')
        result2 = session2.get_result()
        self.log.info(f'session2_results: {result2}')
        self.assertIn(self.constant.START_TRANSACTION_SUCCESS_MSG,
                      result1, f"执行失败:{text2}")
        self.assertIn('AccessExclusiveLock', result2, f"执行失败:{text3}")
        self.assertIn(self.constant.ALTER_TABLE_MSG, result1,
                      f"执行失败:{text2}")
        self.assertIn(self.constant.ROLLBACK_MSG, result1, f"执行失败:{text2}")
        self.assertTrue(self.constant.TABLE_DROP_SUCCESS in result2 and
                        self.constant.COMMIT_SUCCESS_MSG in result2,
                        f"执行失败:{text3}")

    def tearDown(self):
        text4 = '-----step4:清理环境;expect:成功-----'
        self.log.info(text4)
        drop_res = self.pri_sh.execut_db_sql(
            f"drop table if exists {self.table} cascade;")
        self.log.info(drop_res)
        self.assertIn(self.constant.TABLE_DROP_SUCCESS, drop_res,
                      f"删表失败:{text4}")
        self.log.info(f'-----{os.path.basename(__file__)} end-----')
